The entomologist is today one of the many right hand men of the medical profession. In order to appreciate the special character of the knowledge with which the entomologists deal, one needs but to turn the pages of this encyclopedic work and to realize that the information here contained is given as a brief course in the London School of Tropical Medicine. The book covers twenty-eight meetings, consisting of short lectures, followed by demonstrations and laboratory work with explanatory notes and drawings. In these meetings the students learn all about the various types of insects, ticks, mites and other similar enemies of man. Five hundred and fifty-eight demonstration specimens are concerned, and enough information is given to enable any careful student to know all about the anatomy, physiology, habits and relationship to man of the groups and of the individual members of the groups that are considered.